Dark and rough elbows may be caused by physiological factors, such as daily friction; it may also be caused by pathological factors, such as common ichthyosis and dry eczema. It can be treated by applying symptomatic drugs according to different situations. 1. Physiological factors: common in daily friction, long time friction will lead to localized thickening of the stratum corneum, elbow skin will be black and rough. Usually there is no need to deal with, reduce local friction; if it affects the aesthetics, you can use drugs to reduce keratosis under the guidance of the doctor, such as retinoic acid ointment, salicylic acid ointment and so on. 2. Pathologic factors: (1) Ordinary type ichthyosis: the disease usually manifests as dry, rough skin all over the body, with ichthyosiform light gray-brown flaking, and the elbow can be blackened and rough. Patients can use petroleum jelly, urea ointment and other moisturizing treatment, the serious condition can be in compliance with the doctor’s prescription oral retinoic acid drugs. (2) dry eczema: the elbow blackened and rough, may be due to dry eczema. Can be used externally with moisturizing effect of drugs, such as urea cream, but also oral antihistamine treatment. If your elbows are dark and rough, you should avoid friction and go to the hospital in time to determine the cause of your condition under the doctor’s diagnosis, and then take the appropriate treatment.